#!/bin/bash
#
# Processes input text and outputs commands to be executed as a result
#
# This script does not actually execute the commands or further validate them.
#
#   Copyright (C) 2011 Mike Gerwitz
#
#   This file is part of gsgp. This program is free software: you can
#   redistribute it and/or modify it under the terms of the GNU General Public
#   License as published by the Free Software Foundation, either version 3 of
#   the License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
##

words="$1"
max_words=2
scene=$( cat - )

# scene data should be provided via stdin
[ "$scene" ] || {
    echo "No scene data provided" >&2
    exit 1
}

# our processing method depends heavily on the word count
count=$( grep -o '\w\+' <<< "$words" | wc -l )

# the action is every word except the last, and the object being acted upon is
# the final word
action=$( sed 's/^\(.\+\) .\+$/\1/' <<< "$words" )
object=$( grep -o '[^ ]\+$' <<< "$words" )

# if only one word was given, then we need to ask what to do
if [ "$count" -eq 1 ]; then
    # is it a known object?
    grep -q "^OBJECT $action" <<< "$scene" && {
        echo "MSG What about $action?"
        exit 2
    }

    # otherwise, we have no idea what the user is babbling about
    echo "MSG Please elaborate."
    exit 2
fi

# check for am action on a known object and output the associated commands, left
# trimmed
awk "
    /^OBJECT $object$/ {
        found = 1
        getline
    }
    found && /^[ \\t]*$|^[A-Z]/ {
        found = 0
    }

    /^(    |\\t)ACTION $action$/ {
        if ( found ) {
            getline

            while ( !/^(    |\\t)[^ \\t]|^$/ ) {
                print
                getline
            }
        }
    }
    " <<< "$scene" \
    | sed 's/^[ \t]\+//'